Per 9to5Mac, C-Spire Wireless is now selling the iPhone 4S for US$50 off the standard retail price. The discount, which is only available when signing up for a new two-year agreement, brings the price for the 16GB iPhone 4S to US$150 and the 32GB and 64GB models to US$250 and US$350, respectively.

In addition, the carrier is offering US$25 off the 8GB iPhone 4, bringing the price for that model to US$75. C-Spire launched the iPhone 4S on its network last November.